package cn.leancloud.utils;

import java.util.HashMap;
import java.util.Map;

public final class MimeUtils {
  private static final Map<String, String> mimeTypeToExtensionMap = new HashMap<String, String>();
  private static final Map<String, String> extensionToMimeTypeMap = new HashMap<String, String>();
  static {
    // The following table is based on /etc/mime.types data minus
    // chemical/* MIME types and MIME types that don't map to any
    // file extensions. We also exclude top-level domain names to
    // deal with cases like:
    //
    // mail.google.com/a/google.com
    //
    // and "active" MIME types (due to potential security issues).
    // Note that this list is _not_ in alphabetical order and must not be sorted.
    // The "most popular" extension must come first, so that it's the one returned
    // by guessExtensionFromMimeType.
    add("application/andrew-inset", "ez");
    add("application/dsptype", "tsp");
    add("application/futuresplash", "spl");
    add("application/hta", "hta");
    add("application/mac-binhex40", "hqx");
    add("application/mac-compactpro", "cpt");
    add("application/mathematica", "nb");
    add("application/msaccess", "mdb");
    add("application/oda", "oda");
    add("application/ogg", "ogg");
    add("application/pdf", "pdf");
    add("application/pgp-keys", "key");
    add("application/pgp-signature", "pgp");
    add("application/pics-rules", "prf");
    add("application/pkix-cert", "cer");
    add("application/rar", "rar");
    add("application/rdf+xml", "rdf");
    add("application/rss+xml", "rss");
    add("application/zip", "zip");
    add("application/vnd.android.package-archive", "apk");
    add("application/vnd.cinderella", "cdy");
    add("application/vnd.ms-pki.stl", "stl");
    add("application/vnd.oasis.opendocument.database", "odb");
    add("application/vnd.oasis.opendocument.formula", "odf");
    add("application/vnd.oasis.opendocument.graphics", "odg");
    add("application/vnd.oasis.opendocument.graphics-template", "otg");
    add("application/vnd.oasis.opendocument.image", "odi");
    add("application/vnd.oasis.opendocument.spreadsheet", "ods");
    add("application/vnd.oasis.opendocument.spreadsheet-template", "ots");
    add("application/vnd.oasis.opendocument.text", "odt");
    add("application/vnd.oasis.opendocument.text-master", "odm");
    add("application/vnd.oasis.opendocument.text-template", "ott");
    add("application/vnd.oasis.opendocument.text-web", "oth");
    add("application/vnd.google-earth.kml+xml", "kml");
    add("application/vnd.google-earth.kmz", "kmz");
    add("application/msword", "doc");
    add("application/msword", "dot");
    add("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");
    add("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx");
    add("application/vnd.ms-excel", "xls");
    add("application/vnd.ms-excel", "xlt");
    add("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");
    add("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx");
    add("application/vnd.ms-powerpoint", "ppt");
    add("application/vnd.ms-powerpoint", "pot");
    add("application/vnd.ms-powerpoint", "pps");
    add("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");
    add("application/vnd.openxmlformats-officedocument.presentationml.template", "potx");
    add("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx");
    add("application/vnd.rim.cod", "cod");
    add("application/vnd.smaf", "mmf");
    add("application/vnd.stardivision.calc", "sdc");
    add("application/vnd.stardivision.draw", "sda");
    add("application/vnd.stardivision.impress", "sdd");
    add("application/vnd.stardivision.impress", "sdp");
    add("application/vnd.stardivision.math", "smf");
    add("application/vnd.stardivision.writer", "sdw");
    add("application/vnd.stardivision.writer", "vor");
    add("application/vnd.stardivision.writer-global", "sgl");
    add("application/vnd.sun.xml.calc", "sxc");
    add("application/vnd.sun.xml.calc.template", "stc");
    add("application/vnd.sun.xml.draw", "sxd");
    add("application/vnd.sun.xml.draw.template", "std");
    add("application/vnd.sun.xml.impress", "sxi");
    add("application/vnd.sun.xml.impress.template", "sti");
    add("application/vnd.sun.xml.math", "sxm");
    add("application/vnd.sun.xml.writer", "sxw");
    add("application/vnd.sun.xml.writer.global", "sxg");
    add("application/vnd.sun.xml.writer.template", "stw");
    add("application/vnd.visio", "vsd");
    add("application/x-abiword", "abw");
    add("application/x-apple-diskimage", "dmg");
    add("application/x-bcpio", "bcpio");
    add("application/x-bittorrent", "torrent");
    add("application/x-cdf", "cdf");
    add("application/x-cdlink", "vcd");
    add("application/x-chess-pgn", "pgn");
    add("application/x-cpio", "cpio");
    add("application/x-debian-package", "deb");
    add("application/x-debian-package", "udeb");
    add("application/x-director", "dcr");
    add("application/x-director", "dir");
    add("application/x-director", "dxr");
    add("application/x-dms", "dms");
    add("application/x-doom", "wad");
    add("application/x-dvi", "dvi");
    add("application/x-flac", "flac");
    add("application/x-font", "pfa");
    add("application/x-font", "pfb");
    add("application/x-font", "gsf");
    add("application/x-font", "pcf");
    add("application/x-font", "pcf.Z");
    add("application/x-freemind", "mm");
    add("application/x-futuresplash", "spl");
    add("application/x-gnumeric", "gnumeric");
    add("application/x-go-sgf", "sgf");
    add("application/x-graphing-calculator", "gcf");
    add("application/x-gtar", "tgz");
    add("application/x-gtar", "gtar");
    add("application/x-gtar", "taz");
    add("application/x-hdf", "hdf");
    add("application/x-ica", "ica");
    add("application/x-internet-signup", "ins");
    add("application/x-internet-signup", "isp");
    add("application/x-iphone", "iii");
    add("application/x-iso9660-image", "iso");
    add("application/x-jmol", "jmz");
    add("application/x-kchart", "chrt");
    add("application/x-killustrator", "kil");
    add("application/x-koan", "skp");
    add("application/x-koan", "skd");
    add("application/x-koan", "skt");
    add("application/x-koan", "skm");
    add("application/x-kpresenter", "kpr");
    add("application/x-kpresenter", "kpt");
    add("application/x-kspread", "ksp");
    add("application/x-kword", "kwd");
    add("application/x-kword", "kwt");
    add("application/x-latex", "latex");
    add("application/x-lha", "lha");
    add("application/x-lzh", "lzh");
    add("application/x-lzx", "lzx");
    add("application/x-maker", "frm");
    add("application/x-maker", "maker");
    add("application/x-maker", "frame");
    add("application/x-maker", "fb");
    add("application/x-maker", "book");
    add("application/x-maker", "fbdoc");
    add("application/x-mif", "mif");
    add("application/x-ms-wmd", "wmd");
    add("application/x-ms-wmz", "wmz");
    add("application/x-msi", "msi");
    add("application/x-ns-proxy-autoconfig", "pac");
    add("application/x-nwc", "nwc");
    add("application/x-object", "o");
    add("application/x-oz-application", "oza");
    add("application/x-pem-file", "pem");
    add("application/x-pkcs12", "p12");
    add("application/x-pkcs12", "pfx");
    add("application/x-pkcs7-certreqresp", "p7r");
    add("application/x-pkcs7-crl", "crl");
    add("application/x-quicktimeplayer", "qtl");
    add("application/x-shar", "shar");
    add("application/x-shockwave-flash", "swf");
    add("application/x-stuffit", "sit");
    add("application/x-sv4cpio", "sv4cpio");
    add("application/x-sv4crc", "sv4crc");
    add("application/x-tar", "tar");
    add("application/x-texinfo", "texinfo");
    add("application/x-texinfo", "texi");
    add("application/x-troff", "t");
    add("application/x-troff", "roff");
    add("application/x-troff-man", "man");
    add("application/x-ustar", "ustar");
    add("application/x-wais-source", "src");
    add("application/x-wingz", "wz");
    add("application/x-webarchive", "webarchive");
    add("application/x-webarchive-xml", "webarchivexml");
    add("application/x-x509-ca-cert", "crt");
    add("application/x-x509-user-cert", "crt");
    add("application/x-x509-server-cert", "crt");
    add("application/x-xcf", "xcf");
    add("application/x-xfig", "fig");
    add("application/xhtml+xml", "xhtml");
    add("audio/3gpp", "3gpp");
    add("audio/amr", "amr");
    add("audio/basic", "snd");
    add("audio/midi", "mid");
    add("audio/midi", "midi");
    add("audio/midi", "kar");
    add("audio/midi", "xmf");
    add("audio/mobile-xmf", "mxmf");
    // add ".mp3" first so it will be the default for guessExtensionFromMimeType
    add("audio/mpeg", "mp3");
    add("audio/mpeg", "mpga");
    add("audio/mpeg", "mpega");
    add("audio/mpeg", "mp2");
    add("audio/mpeg", "m4a");
    add("audio/mpegurl", "m3u");
    add("audio/prs.sid", "sid");
    add("audio/x-aiff", "aif");
    add("audio/x-aiff", "aiff");
    add("audio/x-aiff", "aifc");
    add("audio/x-gsm", "gsm");
    add("audio/x-mpegurl", "m3u");
    add("audio/x-ms-wma", "wma");
    add("audio/x-ms-wax", "wax");
    add("audio/x-pn-realaudio", "ra");
    add("audio/x-pn-realaudio", "rm");
    add("audio/x-pn-realaudio", "ram");
    add("audio/x-realaudio", "ra");
    add("audio/x-scpls", "pls");
    add("audio/x-sd2", "sd2");
    add("audio/x-wav", "wav");
    add("image/bmp", "bmp");
    add("image/gif", "gif");
    add("image/ico", "cur");
    add("image/ico", "ico");
    add("image/ief", "ief");
    add("image/jpeg", "jpeg");
    add("image/jpeg", "jpg");
    add("image/jpeg", "jpe");
    add("image/pcx", "pcx");
    add("image/png", "png");
    add("image/svg+xml", "svg");
    add("image/svg+xml", "svgz");
    add("image/tiff", "tiff");
    add("image/tiff", "tif");
    add("image/vnd.djvu", "djvu");
    add("image/vnd.djvu", "djv");
    add("image/vnd.wap.wbmp", "wbmp");
    add("image/x-cmu-raster", "ras");
    add("image/x-coreldraw", "cdr");
    add("image/x-coreldrawpattern", "pat");
    add("image/x-coreldrawtemplate", "cdt");
    add("image/x-corelphotopaint", "cpt");
    add("image/x-icon", "ico");
    add("image/x-jg", "art");
    add("image/x-jng", "jng");
    add("image/x-ms-bmp", "bmp");
    add("image/x-photoshop", "psd");
    add("image/x-portable-anymap", "pnm");
    add("image/x-portable-bitmap", "pbm");
    add("image/x-portable-graymap", "pgm");
    add("image/x-portable-pixmap", "ppm");
    add("image/x-rgb", "rgb");
    add("image/x-xbitmap", "xbm");
    add("image/x-xpixmap", "xpm");
    add("image/x-xwindowdump", "xwd");
    add("model/iges", "igs");
    add("model/iges", "iges");
    add("model/mesh", "msh");
    add("model/mesh", "mesh");
    add("model/mesh", "silo");
    add("text/calendar", "ics");
    add("text/calendar", "icz");
    add("text/comma-separated-values", "csv");
    add("text/css", "css");
    add("text/html", "htm");
    add("text/html", "html");
    add("text/h323", "323");
    add("text/iuls", "uls");
    add("text/mathml", "mml");
    // add ".txt" first so it will be the default for guessExtensionFromMimeType
    add("text/plain", "txt");
    add("text/plain", "asc");
    add("text/plain", "text");
    add("text/plain", "diff");
    add("text/plain", "po");     // reserve "pot" for vnd.ms-powerpoint
    add("text/richtext", "rtx");
    add("text/rtf", "rtf");
    add("text/texmacs", "ts");
    add("text/text", "phps");
    add("text/tab-separated-values", "tsv");
    add("text/xml", "xml");
    add("text/x-bibtex", "bib");
    add("text/x-boo", "boo");
    add("text/x-c++hdr", "hpp");
    add("text/x-c++hdr", "h++");
    add("text/x-c++hdr", "hxx");
    add("text/x-c++hdr", "hh");
    add("text/x-c++src", "cpp");
    add("text/x-c++src", "c++");
    add("text/x-c++src", "cc");
    add("text/x-c++src", "cxx");
    add("text/x-chdr", "h");
    add("text/x-component", "htc");
    add("text/x-csh", "csh");
    add("text/x-csrc", "c");
    add("text/x-dsrc", "d");
    add("text/x-haskell", "hs");
    add("text/x-java", "java");
    add("text/x-literate-haskell", "lhs");
    add("text/x-moc", "moc");
    add("text/x-pascal", "p");
    add("text/x-pascal", "pas");
    add("text/x-pcs-gcd", "gcd");
    add("text/x-setext", "etx");
    add("text/x-tcl", "tcl");
    add("text/x-tex", "tex");
    add("text/x-tex", "ltx");
    add("text/x-tex", "sty");
    add("text/x-tex", "cls");
    add("text/x-vcalendar", "vcs");
    add("text/x-vcard", "vcf");
    add("video/3gpp", "3gpp");
    add("video/3gpp", "3gp");
    add("video/3gpp", "3g2");
    add("video/dl", "dl");
    add("video/dv", "dif");
    add("video/dv", "dv");
    add("video/fli", "fli");
    add("video/m4v", "m4v");
    add("video/mpeg", "mpeg");
    add("video/mpeg", "mpg");
    add("video/mpeg", "mpe");
    add("video/mp4", "mp4");
    add("video/mpeg", "VOB");
    add("video/quicktime", "qt");
    add("video/quicktime", "mov");
    add("video/vnd.mpegurl", "mxu");
    add("video/x-la-asf", "lsf");
    add("video/x-la-asf", "lsx");
    add("video/x-mng", "mng");
    add("video/x-ms-asf", "asf");
    add("video/x-ms-asf", "asx");
    add("video/x-ms-wm", "wm");
    add("video/x-ms-wmv", "wmv");
    add("video/x-ms-wmx", "wmx");
    add("video/x-ms-wvx", "wvx");
    add("video/x-msvideo", "avi");
    add("video/x-sgi-movie", "movie");
    add("video/x-webex", "wrf");
    add("x-conference/x-cooltalk", "ice");
    add("x-epoc/x-sisx-app", "sisx");
//    applyOverrides();
  }
  private static void add(String mimeType, String extension) {
    //
    // if we have an existing x --> y mapping, we do not want to
    // override it with another mapping x --> ?
    // this is mostly because of the way the mime-type map below
    // is constructed (if a mime type maps to several extensions
    // the first extension is considered the most popular and is
    // added first; we do not want to overwrite it later).
    //
    if (!mimeTypeToExtensionMap.containsKey(mimeType)) {
      mimeTypeToExtensionMap.put(mimeType, extension);
    }
    extensionToMimeTypeMap.put(extension, mimeType);
  }
//  private static InputStream getContentTypesPropertiesStream() {
//    // User override?
//    String userTable = System.getProperty("content.types.user.table");
//    if (userTable != null) {
//      File f = new File(userTable);
//      if (f.exists()) {
//        try {
//          return new FileInputStream(f);
//        } catch (IOException ignored) {
//        }
//      }
//    }
//    // Standard location?
//    File f = new File(System.getProperty("java.home"), "lib" + File.separator + "content-types.properties");
//    if (f.exists()) {
//      try {
//        return new FileInputStream(f);
//      } catch (IOException ignored) {
//      }
//    }
//    return null;
//  }
//  private static void applyOverrides() {
//    // Get the appropriate InputStream to read overrides from, if any.
//    InputStream stream = getContentTypesPropertiesStream();
//    if (stream == null) {
//      return;
//    }
//    try {
//      try {
//        // Read the properties file...
//        Properties overrides = new Properties();
//        overrides.load(stream);
//        // And translate its mapping to ours...
//        for (Map.Entry<Object, Object> entry : overrides.entrySet()) {
//          String extension = (String) entry.getKey();
//          String mimeType = (String) entry.getValue();
//          add(mimeType, extension);
//        }
//      } finally {
//        stream.close();
//      }
//    } catch (IOException ignored) {
//    }
//  }
  private MimeUtils() {
  }
  public static String guessExtensionFromMimeType(String mimeType) {
    if (mimeType == null || mimeType.isEmpty()) {
      return null;
    }
    return mimeTypeToExtensionMap.get(mimeType);
  }
  public static String guessMimeTypeFromExtension(String extension) {
    if (extension == null || extension.isEmpty()) {
      return null;
    }
    return extensionToMimeTypeMap.get(extension);
  }
}
